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<div id="overview"><a href="../../../../../apidocs/com/totsp/gwittir/service/StreamServiceUtils.html">View Javadoc</a></div><pre>

<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * To change this template, choose Tools | Templates</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> * and open the template in the editor.</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> */</em>
<a name="5" href="#5">5</a>   <strong class="jxr_keyword">package</strong> com.totsp.gwittir.service;
<a name="6" href="#6">6</a>   
<a name="7" href="#7">7</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException;
<a name="8" href="#8">8</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.rpc.SerializationException;
<a name="9" href="#9">9</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.RPCRequest;
<a name="10" href="#10">10</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.RemoteServiceServlet;
<a name="11" href="#11">11</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.SerializationPolicy;
<a name="12" href="#12">12</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.SerializationPolicyProvider;
<a name="13" href="#13">13</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader;
<a name="14" href="#14">14</a>  
<a name="15" href="#15">15</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter;
<a name="16" href="#16">16</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Method;
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.HashSet;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a name="22" href="#22">22</a>  
<a name="23" href="#23">23</a>  
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment">/**</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> *</em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * @author kebernet</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> */</em>
<a name="28" href="#28">28</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../com/totsp/gwittir/service/StreamServiceUtils.html">StreamServiceUtils</a> {
<a name="29" href="#29">29</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> HashMap&lt;String, Class&lt;?&gt;&gt; TYPE_NAMES;
<a name="30" href="#30">30</a>  
<a name="31" href="#31">31</a>      <em class="jxr_javadoccomment">/**</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">     * Maps primitive wrapper classes to their corresponding primitive class.</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment">     */</em>
<a name="34" href="#34">34</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Map&lt;Class&lt;?&gt;, Class&lt;?&gt;&gt; PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS =
<a name="35" href="#35">35</a>          <strong class="jxr_keyword">new</strong> HashMap&lt;Class&lt;?&gt;, Class&lt;?&gt;&gt;();
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>      <em class="jxr_javadoccomment">/**</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment">     * Static map of classes to sets of interfaces (e.g. classes). Optimizes</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment">     * lookup of interfaces for security.</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment">     */</em>
<a name="41" href="#41">41</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Map&lt;Class&lt;?&gt;, Set&lt;String&gt;&gt; serviceToImplementedInterfacesMap;
<a name="42" href="#42">42</a>  
<a name="43" href="#43">43</a>      <strong class="jxr_keyword">static</strong> {
<a name="44" href="#44">44</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Boolean.<strong class="jxr_keyword">class</strong>,
<a name="45" href="#45">45</a>              Boolean.TYPE);
<a name="46" href="#46">46</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Byte.<strong class="jxr_keyword">class</strong>, Byte.TYPE);
<a name="47" href="#47">47</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Character.<strong class="jxr_keyword">class</strong>,
<a name="48" href="#48">48</a>              Character.TYPE);
<a name="49" href="#49">49</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Double.<strong class="jxr_keyword">class</strong>, Double.TYPE);
<a name="50" href="#50">50</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Float.<strong class="jxr_keyword">class</strong>, Float.TYPE);
<a name="51" href="#51">51</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Integer.<strong class="jxr_keyword">class</strong>,
<a name="52" href="#52">52</a>              Integer.TYPE);
<a name="53" href="#53">53</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Long.<strong class="jxr_keyword">class</strong>, Long.TYPE);
<a name="54" href="#54">54</a>          PRIMITIVE_WRAPPER_CLASS_TO_PRIMITIVE_CLASS.put(Short.<strong class="jxr_keyword">class</strong>, Short.TYPE);
<a name="55" href="#55">55</a>  
<a name="56" href="#56">56</a>          TYPE_NAMES = <strong class="jxr_keyword">new</strong> HashMap&lt;String, Class&lt;?&gt;&gt;();
<a name="57" href="#57">57</a>          TYPE_NAMES.put(<span class="jxr_string">"Z"</span>, <strong class="jxr_keyword">boolean</strong>.<strong class="jxr_keyword">class</strong>);
<a name="58" href="#58">58</a>          TYPE_NAMES.put(<span class="jxr_string">"B"</span>, byte.<strong class="jxr_keyword">class</strong>);
<a name="59" href="#59">59</a>          TYPE_NAMES.put(<span class="jxr_string">"C"</span>, <strong class="jxr_keyword">char</strong>.<strong class="jxr_keyword">class</strong>);
<a name="60" href="#60">60</a>          TYPE_NAMES.put(<span class="jxr_string">"D"</span>, <strong class="jxr_keyword">double</strong>.<strong class="jxr_keyword">class</strong>);
<a name="61" href="#61">61</a>          TYPE_NAMES.put(<span class="jxr_string">"F"</span>, <strong class="jxr_keyword">float</strong>.<strong class="jxr_keyword">class</strong>);
<a name="62" href="#62">62</a>          TYPE_NAMES.put(<span class="jxr_string">"I"</span>, <strong class="jxr_keyword">int</strong>.<strong class="jxr_keyword">class</strong>);
<a name="63" href="#63">63</a>          TYPE_NAMES.put(<span class="jxr_string">"J"</span>, <strong class="jxr_keyword">long</strong>.<strong class="jxr_keyword">class</strong>);
<a name="64" href="#64">64</a>          TYPE_NAMES.put(<span class="jxr_string">"S"</span>, <strong class="jxr_keyword">short</strong>.<strong class="jxr_keyword">class</strong>);
<a name="65" href="#65">65</a>  
<a name="66" href="#66">66</a>          serviceToImplementedInterfacesMap = <strong class="jxr_keyword">new</strong> HashMap&lt;Class&lt;?&gt;, Set&lt;String&gt;&gt;();
<a name="67" href="#67">67</a>      }
<a name="68" href="#68">68</a>  
<a name="69" href="#69">69</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> RPCRequest decodeRequest(String encodedRequest,
<a name="70" href="#70">70</a>          Class&lt;?&gt; type, SerializationPolicyProvider serializationPolicyProvider) {
<a name="71" href="#71">71</a>          <strong class="jxr_keyword">if</strong> (encodedRequest == <strong class="jxr_keyword">null</strong>) {
<a name="72" href="#72">72</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"encodedRequest cannot be null"</span>);
<a name="73" href="#73">73</a>          }
<a name="74" href="#74">74</a>  
<a name="75" href="#75">75</a>          <strong class="jxr_keyword">if</strong> (encodedRequest.length() == 0) {
<a name="76" href="#76">76</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"encodedRequest cannot be empty"</span>);
<a name="77" href="#77">77</a>          }
<a name="78" href="#78">78</a>  
<a name="79" href="#79">79</a>          ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
<a name="80" href="#80">80</a>  
<a name="81" href="#81">81</a>          <strong class="jxr_keyword">try</strong> {
<a name="82" href="#82">82</a>              ServerSerializationStreamReader streamReader = <strong class="jxr_keyword">new</strong> ServerSerializationStreamReader(classLoader,
<a name="83" href="#83">83</a>                      serializationPolicyProvider);
<a name="84" href="#84">84</a>              streamReader.prepareToRead(encodedRequest);
<a name="85" href="#85">85</a>  
<a name="86" href="#86">86</a>              <em class="jxr_comment">// Read the name of the RemoteService interface</em>
<a name="87" href="#87">87</a>              String serviceIntfName = streamReader.readString();
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>              <em class="jxr_comment">//            if (type != null) {</em>
<a name="90" href="#90">90</a>              <em class="jxr_comment">//                if (!implementsInterface(type, serviceIntfName)) {</em>
<a name="91" href="#91">91</a>              <em class="jxr_comment">//                    // The service does not implement the requested interface</em>
<a name="92" href="#92">92</a>              <em class="jxr_comment">//                    throw new IncompatibleRemoteServiceException(</em>
<a name="93" href="#93">93</a>              <em class="jxr_comment">//                        "Blocked attempt to access interface '" +</em>
<a name="94" href="#94">94</a>              <em class="jxr_comment">//                        serviceIntfName + "', which is not implemented by '" +</em>
<a name="95" href="#95">95</a>              <em class="jxr_comment">//                        printTypeName(type) +</em>
<a name="96" href="#96">96</a>              <em class="jxr_comment">//                        "'; this is either misconfiguration or a hack attempt");</em>
<a name="97" href="#97">97</a>              <em class="jxr_comment">//                }</em>
<a name="98" href="#98">98</a>              <em class="jxr_comment">//            }</em>
<a name="99" href="#99">99</a>              SerializationPolicy serializationPolicy = streamReader.getSerializationPolicy();
<a name="100" href="#100">100</a> 
<a name="101" href="#101">101</a>             <em class="jxr_comment">//            Class&lt;?&gt; serviceIntf;</em>
<a name="102" href="#102">102</a> 
<a name="103" href="#103">103</a>             <em class="jxr_comment">//            try {</em>
<a name="104" href="#104">104</a>             <em class="jxr_comment">//                serviceIntf = getClassFromSerializedName(serviceIntfName,</em>
<a name="105" href="#105">105</a>             <em class="jxr_comment">//                        classLoader);</em>
<a name="106" href="#106">106</a>             <em class="jxr_comment">//</em>
<a name="107" href="#107">107</a>             <em class="jxr_comment">//                if (!RemoteService.class.isAssignableFrom(serviceIntf)) {</em>
<a name="108" href="#108">108</a>             <em class="jxr_comment">//                    // The requested interface is not a RemoteService interface</em>
<a name="109" href="#109">109</a>             <em class="jxr_comment">//                    throw new IncompatibleRemoteServiceException(</em>
<a name="110" href="#110">110</a>             <em class="jxr_comment">//                        "Blocked attempt to access interface '" +</em>
<a name="111" href="#111">111</a>             <em class="jxr_comment">//                        printTypeName(serviceIntf) +</em>
<a name="112" href="#112">112</a>             <em class="jxr_comment">//                        "', which doesn't extend RemoteService; this is either misconfiguration or a hack attempt");</em>
<a name="113" href="#113">113</a>             <em class="jxr_comment">//                }</em>
<a name="114" href="#114">114</a>             <em class="jxr_comment">//            } catch (ClassNotFoundException e) {</em>
<a name="115" href="#115">115</a>             <em class="jxr_comment">//                throw new IncompatibleRemoteServiceException(</em>
<a name="116" href="#116">116</a>             <em class="jxr_comment">//                    "Could not locate requested interface '" + serviceIntfName +</em>
<a name="117" href="#117">117</a>             <em class="jxr_comment">//                    "' in default classloader", e);</em>
<a name="118" href="#118">118</a>             <em class="jxr_comment">//            }</em>
<a name="119" href="#119">119</a>             String serviceMethodName = streamReader.readString();
<a name="120" href="#120">120</a> 
<a name="121" href="#121">121</a>             <strong class="jxr_keyword">int</strong> paramCount = streamReader.readInt();
<a name="122" href="#122">122</a>             Class&lt;?&gt;[] parameterTypes = <strong class="jxr_keyword">new</strong> Class[paramCount];
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; parameterTypes.length; i++) {
<a name="125" href="#125">125</a>                 String paramClassName = streamReader.readString();
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>                 <strong class="jxr_keyword">try</strong> {
<a name="128" href="#128">128</a>                     parameterTypes[i] = getClassFromSerializedName(paramClassName,
<a name="129" href="#129">129</a>                             classLoader);
<a name="130" href="#130">130</a>                 } <strong class="jxr_keyword">catch</strong> (ClassNotFoundException e) {
<a name="131" href="#131">131</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IncompatibleRemoteServiceException(<span class="jxr_string">"Parameter "</span> +
<a name="132" href="#132">132</a>                         i + <span class="jxr_string">" of is of an unknown type '"</span> + paramClassName +
<a name="133" href="#133">133</a>                         <span class="jxr_string">"'"</span>, e);
<a name="134" href="#134">134</a>                 }
<a name="135" href="#135">135</a>             }
<a name="136" href="#136">136</a> 
<a name="137" href="#137">137</a>             <strong class="jxr_keyword">try</strong> {
<a name="138" href="#138">138</a>                 Method method = type.getMethod(serviceMethodName, parameterTypes);
<a name="139" href="#139">139</a> 
<a name="140" href="#140">140</a>                 Object[] parameterValues = <strong class="jxr_keyword">new</strong> Object[parameterTypes.length];
<a name="141" href="#141">141</a> 
<a name="142" href="#142">142</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; parameterValues.length; i++) {
<a name="143" href="#143">143</a>                     parameterValues[i] = streamReader.deserializeValue(parameterTypes[i]);
<a name="144" href="#144">144</a>                 }
<a name="145" href="#145">145</a> 
<a name="146" href="#146">146</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> RPCRequest(method, parameterValues,
<a name="147" href="#147">147</a>                     serializationPolicy);
<a name="148" href="#148">148</a>             } <strong class="jxr_keyword">catch</strong> (NoSuchMethodException e) {
<a name="149" href="#149">149</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IncompatibleRemoteServiceException(formatMethodNotFoundErrorMessage(
<a name="150" href="#150">150</a>                         type, serviceMethodName, parameterTypes));
<a name="151" href="#151">151</a>             }
<a name="152" href="#152">152</a>         } <strong class="jxr_keyword">catch</strong> (SerializationException ex) {
<a name="153" href="#153">153</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IncompatibleRemoteServiceException(ex.getMessage(), ex);
<a name="154" href="#154">154</a>         }
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a> 
<a name="157" href="#157">157</a>     <em class="jxr_javadoccomment">/**</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">    * Returns the {@link Class} instance for the named class or primitive type.</em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment">    *</em>
<a name="160" href="#160">160</a> <em class="jxr_javadoccomment">    * @param serializedName the serialized name of a class or primitive type</em>
<a name="161" href="#161">161</a> <em class="jxr_javadoccomment">    * @param classLoader the classLoader used to load {@link Class}es</em>
<a name="162" href="#162">162</a> <em class="jxr_javadoccomment">    * @return Class instance for the given type name</em>
<a name="163" href="#163">163</a> <em class="jxr_javadoccomment">    * @throws ClassNotFoundException if the named type was not found</em>
<a name="164" href="#164">164</a> <em class="jxr_javadoccomment">    */</em>
<a name="165" href="#165">165</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Class&lt;?&gt; getClassFromSerializedName(String serializedName,
<a name="166" href="#166">166</a>         ClassLoader classLoader) <strong class="jxr_keyword">throws</strong> ClassNotFoundException {
<a name="167" href="#167">167</a>         Class&lt;?&gt; value = TYPE_NAMES.get(serializedName);
<a name="168" href="#168">168</a> 
<a name="169" href="#169">169</a>         <strong class="jxr_keyword">if</strong> (value != <strong class="jxr_keyword">null</strong>) {
<a name="170" href="#170">170</a>             <strong class="jxr_keyword">return</strong> value;
<a name="171" href="#171">171</a>         }
<a name="172" href="#172">172</a> 
<a name="173" href="#173">173</a>         <strong class="jxr_keyword">return</strong> Class.forName(serializedName, false, classLoader);
<a name="174" href="#174">174</a>     }
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>     <em class="jxr_javadoccomment">/**</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * Straight copy from</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">     * {@link com.google.gwt.dev.util.TypeInfo#getSourceRepresentation(Class)} to</em>
<a name="179" href="#179">179</a> <em class="jxr_javadoccomment">     * avoid runtime dependency on gwt-dev.</em>
<a name="180" href="#180">180</a> <em class="jxr_javadoccomment">     */</em>
<a name="181" href="#181">181</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> String printTypeName(Class&lt;?&gt; type) {
<a name="182" href="#182">182</a>         <em class="jxr_comment">// Primitives</em>
<a name="183" href="#183">183</a>         <em class="jxr_comment">//</em>
<a name="184" href="#184">184</a>         <strong class="jxr_keyword">if</strong> (type.equals(Integer.TYPE)) {
<a name="185" href="#185">185</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"int"</span>;
<a name="186" href="#186">186</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Long.TYPE)) {
<a name="187" href="#187">187</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"long"</span>;
<a name="188" href="#188">188</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Short.TYPE)) {
<a name="189" href="#189">189</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"short"</span>;
<a name="190" href="#190">190</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Byte.TYPE)) {
<a name="191" href="#191">191</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"byte"</span>;
<a name="192" href="#192">192</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Character.TYPE)) {
<a name="193" href="#193">193</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"char"</span>;
<a name="194" href="#194">194</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Boolean.TYPE)) {
<a name="195" href="#195">195</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"boolean"</span>;
<a name="196" href="#196">196</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Float.TYPE)) {
<a name="197" href="#197">197</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"float"</span>;
<a name="198" href="#198">198</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (type.equals(Double.TYPE)) {
<a name="199" href="#199">199</a>             <strong class="jxr_keyword">return</strong> <span class="jxr_string">"double"</span>;
<a name="200" href="#200">200</a>         }
<a name="201" href="#201">201</a> 
<a name="202" href="#202">202</a>         <em class="jxr_comment">// Arrays</em>
<a name="203" href="#203">203</a>         <em class="jxr_comment">//</em>
<a name="204" href="#204">204</a>         <strong class="jxr_keyword">if</strong> (type.isArray()) {
<a name="205" href="#205">205</a>             Class&lt;?&gt; componentType = type.getComponentType();
<a name="206" href="#206">206</a> 
<a name="207" href="#207">207</a>             <strong class="jxr_keyword">return</strong> printTypeName(componentType) + <span class="jxr_string">"[]"</span>;
<a name="208" href="#208">208</a>         }
<a name="209" href="#209">209</a> 
<a name="210" href="#210">210</a>         <em class="jxr_comment">// Everything else</em>
<a name="211" href="#211">211</a>         <em class="jxr_comment">//</em>
<a name="212" href="#212">212</a>         <strong class="jxr_keyword">return</strong> type.getName().replace('$', '.');
<a name="213" href="#213">213</a>     }
<a name="214" href="#214">214</a> 
<a name="215" href="#215">215</a>     <em class="jxr_javadoccomment">/**</em>
<a name="216" href="#216">216</a> <em class="jxr_javadoccomment">    * Used to determine whether the specified interface name is implemented by</em>
<a name="217" href="#217">217</a> <em class="jxr_javadoccomment">    * the service class. This is done without loading the class (for security).</em>
<a name="218" href="#218">218</a> <em class="jxr_javadoccomment">    */</em>
<a name="219" href="#219">219</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> implementsInterface(Class&lt;?&gt; service, String intfName) {
<a name="220" href="#220">220</a>         <strong class="jxr_keyword">synchronized</strong> (serviceToImplementedInterfacesMap) {
<a name="221" href="#221">221</a>             <em class="jxr_comment">// See if it's cached.</em>
<a name="222" href="#222">222</a>             <em class="jxr_comment">//</em>
<a name="223" href="#223">223</a>             Set&lt;String&gt; interfaceSet = serviceToImplementedInterfacesMap.get(service);
<a name="224" href="#224">224</a> 
<a name="225" href="#225">225</a>             <strong class="jxr_keyword">if</strong> (interfaceSet != <strong class="jxr_keyword">null</strong>) {
<a name="226" href="#226">226</a>                 <strong class="jxr_keyword">if</strong> (interfaceSet.contains(intfName)) {
<a name="227" href="#227">227</a>                     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="228" href="#228">228</a>                 }
<a name="229" href="#229">229</a>             } <strong class="jxr_keyword">else</strong> {
<a name="230" href="#230">230</a>                 interfaceSet = <strong class="jxr_keyword">new</strong> HashSet&lt;String&gt;();
<a name="231" href="#231">231</a>                 serviceToImplementedInterfacesMap.put(service, interfaceSet);
<a name="232" href="#232">232</a>             }
<a name="233" href="#233">233</a> 
<a name="234" href="#234">234</a>             <strong class="jxr_keyword">if</strong> (!service.isInterface()) {
<a name="235" href="#235">235</a>                 <strong class="jxr_keyword">while</strong> ((service != <strong class="jxr_keyword">null</strong>) &amp;&amp;
<a name="236" href="#236">236</a>                         !RemoteServiceServlet.<strong class="jxr_keyword">class</strong>.equals(service)) {
<a name="237" href="#237">237</a>                     Class&lt;?&gt;[] intfs = service.getInterfaces();
<a name="238" href="#238">238</a> 
<a name="239" href="#239">239</a>                     <strong class="jxr_keyword">for</strong> (Class&lt;?&gt; intf : intfs) {
<a name="240" href="#240">240</a>                         <strong class="jxr_keyword">if</strong> (implementsInterfaceRecursive(intf, intfName)) {
<a name="241" href="#241">241</a>                             interfaceSet.add(intfName);
<a name="242" href="#242">242</a> 
<a name="243" href="#243">243</a>                             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="244" href="#244">244</a>                         }
<a name="245" href="#245">245</a>                     }
<a name="246" href="#246">246</a> 
<a name="247" href="#247">247</a>                     <em class="jxr_comment">// did not find the interface in this class so we look in the</em>
<a name="248" href="#248">248</a>                     <em class="jxr_comment">// superclass</em>
<a name="249" href="#249">249</a>                     <em class="jxr_comment">//</em>
<a name="250" href="#250">250</a>                     service = service.getSuperclass();
<a name="251" href="#251">251</a>                 }
<a name="252" href="#252">252</a>             } <strong class="jxr_keyword">else</strong> {
<a name="253" href="#253">253</a>                 <strong class="jxr_keyword">if</strong> (implementsInterfaceRecursive(service, intfName)) {
<a name="254" href="#254">254</a>                     interfaceSet.add(intfName);
<a name="255" href="#255">255</a> 
<a name="256" href="#256">256</a>                     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="257" href="#257">257</a>                 }
<a name="258" href="#258">258</a>             }
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>             <strong class="jxr_keyword">return</strong> false;
<a name="261" href="#261">261</a>         }
<a name="262" href="#262">262</a>     }
<a name="263" href="#263">263</a> 
<a name="264" href="#264">264</a>     <em class="jxr_javadoccomment">/**</em>
<a name="265" href="#265">265</a> <em class="jxr_javadoccomment">     * Only called from implementsInterface().</em>
<a name="266" href="#266">266</a> <em class="jxr_javadoccomment">     */</em>
<a name="267" href="#267">267</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> implementsInterfaceRecursive(Class&lt;?&gt; clazz,
<a name="268" href="#268">268</a>         String intfName) {
<a name="269" href="#269">269</a>         assert (clazz.isInterface());
<a name="270" href="#270">270</a> 
<a name="271" href="#271">271</a>         <strong class="jxr_keyword">if</strong> (clazz.getName().equals(intfName)) {
<a name="272" href="#272">272</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="273" href="#273">273</a>         }
<a name="274" href="#274">274</a> 
<a name="275" href="#275">275</a>         <em class="jxr_comment">// search implemented interfaces</em>
<a name="276" href="#276">276</a>         Class&lt;?&gt;[] intfs = clazz.getInterfaces();
<a name="277" href="#277">277</a> 
<a name="278" href="#278">278</a>         <strong class="jxr_keyword">for</strong> (Class&lt;?&gt; intf : intfs) {
<a name="279" href="#279">279</a>             <strong class="jxr_keyword">if</strong> (implementsInterfaceRecursive(intf, intfName)) {
<a name="280" href="#280">280</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="281" href="#281">281</a>             }
<a name="282" href="#282">282</a>         }
<a name="283" href="#283">283</a> 
<a name="284" href="#284">284</a>         <strong class="jxr_keyword">return</strong> false;
<a name="285" href="#285">285</a>     }
<a name="286" href="#286">286</a> 
<a name="287" href="#287">287</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> String formatMethodNotFoundErrorMessage(
<a name="288" href="#288">288</a>         Class&lt;?&gt; serviceIntf, String serviceMethodName,
<a name="289" href="#289">289</a>         Class&lt;?&gt;[] parameterTypes) {
<a name="290" href="#290">290</a>         StringBuffer sb = <strong class="jxr_keyword">new</strong> StringBuffer();
<a name="291" href="#291">291</a> 
<a name="292" href="#292">292</a>         sb.append(<span class="jxr_string">"Could not locate requested method '"</span>);
<a name="293" href="#293">293</a>         sb.append(serviceMethodName);
<a name="294" href="#294">294</a>         sb.append(<span class="jxr_string">"("</span>);
<a name="295" href="#295">295</a> 
<a name="296" href="#296">296</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; parameterTypes.length; ++i) {
<a name="297" href="#297">297</a>             <strong class="jxr_keyword">if</strong> (i &gt; 0) {
<a name="298" href="#298">298</a>                 sb.append(<span class="jxr_string">", "</span>);
<a name="299" href="#299">299</a>             }
<a name="300" href="#300">300</a> 
<a name="301" href="#301">301</a>             sb.append(printTypeName(parameterTypes[i]));
<a name="302" href="#302">302</a>         }
<a name="303" href="#303">303</a> 
<a name="304" href="#304">304</a>         sb.append(<span class="jxr_string">")'"</span>);
<a name="305" href="#305">305</a> 
<a name="306" href="#306">306</a>         sb.append(<span class="jxr_string">" in interface '"</span>);
<a name="307" href="#307">307</a>         sb.append(printTypeName(serviceIntf));
<a name="308" href="#308">308</a>         sb.append(<span class="jxr_string">"'"</span>);
<a name="309" href="#309">309</a> 
<a name="310" href="#310">310</a>         <strong class="jxr_keyword">return</strong> sb.toString();
<a name="311" href="#311">311</a>     }
<a name="312" href="#312">312</a> 
<a name="313" href="#313">313</a>     <em class="jxr_comment">//</em>
<a name="314" href="#314">314</a>     <em class="jxr_javadoccomment">/**</em>
<a name="315" href="#315">315</a> <em class="jxr_javadoccomment">   * Returns a string that encodes the results of an RPC call. Private overload</em>
<a name="316" href="#316">316</a> <em class="jxr_javadoccomment">   * that takes a flag signaling the preamble of the response payload.</em>
<a name="317" href="#317">317</a> <em class="jxr_javadoccomment">   *</em>
<a name="318" href="#318">318</a> <em class="jxr_javadoccomment">   * @param object the object that we wish to send back to the client</em>
<a name="319" href="#319">319</a> <em class="jxr_javadoccomment">   * @param wasThrown if true, the object being returned was an exception thrown</em>
<a name="320" href="#320">320</a> <em class="jxr_javadoccomment">   *          by the service method; if false, it was the result of the service</em>
<a name="321" href="#321">321</a> <em class="jxr_javadoccomment">   *          method's invocation</em>
<a name="322" href="#322">322</a> <em class="jxr_javadoccomment">   * @return a string that encodes the response from a service method</em>
<a name="323" href="#323">323</a> <em class="jxr_javadoccomment">   * @throws SerializationException if the object cannot be serialized</em>
<a name="324" href="#324">324</a> <em class="jxr_javadoccomment">   */</em>
<a name="325" href="#325">325</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String encodeResponse(Class&lt;?&gt; responseClass, Object object,
<a name="326" href="#326">326</a>       <strong class="jxr_keyword">boolean</strong> wasThrown, SerializationPolicy serializationPolicy)
<a name="327" href="#327">327</a>       <strong class="jxr_keyword">throws</strong> SerializationException {
<a name="328" href="#328">328</a> 
<a name="329" href="#329">329</a>     ServerSerializationStreamWriter stream = <strong class="jxr_keyword">new</strong> ServerSerializationStreamWriter(
<a name="330" href="#330">330</a>         serializationPolicy);
<a name="331" href="#331">331</a> 
<a name="332" href="#332">332</a>     stream.prepareToWrite();
<a name="333" href="#333">333</a>     <strong class="jxr_keyword">if</strong> (responseClass != <strong class="jxr_keyword">void</strong>.<strong class="jxr_keyword">class</strong>) {
<a name="334" href="#334">334</a>       stream.serializeValue(object, responseClass);
<a name="335" href="#335">335</a>     }
<a name="336" href="#336">336</a> 
<a name="337" href="#337">337</a>     String bufferStr = (wasThrown ? <span class="jxr_string">"//EX"</span> : <span class="jxr_string">"//OK"</span>) + stream.toString();
<a name="338" href="#338">338</a>     <strong class="jxr_keyword">return</strong> bufferStr;
<a name="339" href="#339">339</a>   }
<a name="340" href="#340">340</a> }
</pre>
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